Fusion centers are operated by both state and federal governments. Created after 2001, as part of the Homeland Security Act, in order to "protect" the citizens during the War on Terrorism. Since then, the aggregation of live electronic surveillance being collected and shared nationwide has exponentially expanded:

Welcome to the California State Threat Assessment System home page.

The Dept. of Homeland Security, through laws and contracts aggregates the states' information and has access to it.:

https://www.dhs.gov/fusion-centers